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| Patents for Dupont Mfg. Co. | |||||
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| Number | Date | Patentee | Title | Type | |
| 429,807 | Jun. 10, 1890 | P.D. Dupont | Power-hammer spring | drop hammers | |
| CA-36,927 | Jul. 04, 1891 | P.D. Dupont | Coil spring power hammer | drop hammers | |
| 513,326 | Jan. 23, 1894 | L.D. Howard | Power-hammer | drop hammers | |
| CA-58,429 | Dec. 17, 1897 | P.D. Dupont | Tire-setting machine | tire setting machines | |
| 642,070 | Jan. 30, 1900 | E.H. Blossom | Power-hammer | drop hammers | |